Steve Ballmer, chief executive officer of Microsoft Corp., pauses while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., pauses while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., leaves the stage wearing a hat after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp. Chief Executive Officer Steve Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., leaves the stage wearing a hat after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp. Chief Executive Officer Steve Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., left, and Steve Ballmer, chief executive officer of Microsoft Corp., leave the stage wearing hats after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., left, and Steve Ballmer, chief executive officer of Microsoft Corp., leave the stage wearing hats after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., gestures while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., gestures while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., pauses while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp. Chief Executive Officer Steve Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., pauses while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp. Chief Executive Officer Steve Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., gestures while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., gestures while speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., holds a Microsoft Surface tablet as he speaks during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Steve Ballmer, chief executive officer of Microsoft Corp., holds a Microsoft Surface tablet as he speaks during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., left, and Steve Ballmer, chief executive officer of Microsoft Corp., leave the stage wearing hats after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images

Reid Hoffman, chairman and co-founder of LinkedIn Corp., left, and Steve Ballmer, chief executive officer of Microsoft Corp., leave the stage wearing hats after speaking during an event at the Churchill Club in Santa Clara, California, U.S., on Wednesday, Nov. 14, 2012. Microsoft Corp's Ballmer said the maker of Windows programs must exploit the opportunity to combine hardware and software as it challenges Apple Inc.’s iPad with the Surface tablet computer. Photographer: David Paul Morris/Bloomberg via Getty Images